in case of missing reference (that happens for Dynamic Category Property), we...

in case of missing reference (that happens for Dynamic Category Property), we need to have '' instead of None to avoid exception in join().

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@43466 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/PropertySheetsTool_viewContentList/listbox_children_reference.xml

@@ -63,6 +63,10 @@
                       <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
                     </value>
                 </item>
+                <item>
+                    <key> <string>editable</string> </key>
+                    <value> <string></string> </value>
+                </item>
                 <item>
                     <key> <string>enabled</string> </key>
                     <value>
@@ -93,6 +97,10 @@
                     <key> <string>target</string> </key>
                     <value> <string></string> </value>
                 </item>
+                <item>
+                    <key> <string>title</string> </key>
+                    <value> <string></string> </value>
+                </item>
               </dictionary>
             </value>
         </item>
@@ -180,7 +188,7 @@
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>python: [(sp.getReference(), sp.getRelativeUrl()) for sp in cell.contentValues()]</string> </value>
+            <value> <string>python: [(sp.getReference(\'\'), sp.getRelativeUrl()) for sp in cell.contentValues()]</string> </value>
         </item>
       </dictionary>
     </pickle>

product/ERP5/bootstrap/erp5_core/bt/revision

-40887
+40888
\ No newline at end of file